The video from a nearby bus doesn't show the fight, but it does capture some of the sound.

Bierman said he saw a man assaulting a woman at Second Street and National Avenue on Oct. 6 and intervened.

He can be heard asking what's going on, and the woman screaming at the suspect, who turned out to be her boyfriend.

After Bierman brought the woman to the nearby bus, he told the driver what happened.

"He was grabbing her and throwing her around like a rag doll. She's screaming, 'Stop, stop, let me alone, let me alone.' I went over and told him to stop, and leave her alone," Bierman said on the video. "I walked up to him and said, 'Stop,' and he slugged me in the chest twice."

Bierman said his lawyer is now advising him against talking about the incident, and Milwaukee's county executive wants the Transit System to take another look at the firing.

"I look at this video and anybody who sees this video and you hear somebody crying for help. He doesn't interrupt a bus he's driving. It's on a break, and he goes to help somebody who's obviously in distress," Abele said.

The transit system fired Bierman for violating the workplace violence policy. It's now promising to meet with Milwaukee County's transportation director.

A spokeswoman told WISN 12 News, "We welcome the opportunity to meet with Mr. Dranzik so that we can listen to the county's concerns and act in conformity with the county's wishes."

The boyfriend pleaded no contest to a disorderly conduct ticket and was fined $185.

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Forty years ago, one of the greatest boxing matches in history took place in an unlikely setting: the capital of the Philippines. Muhammad Ali's epic win over great rival Joe Frazier in 1975 became known as the "Thrilla in Manila."